Hi Justin, in the CS600 the Genalex KT77 have not the chance to compete with the EL34-ST.
I have them since a week and there is no other tube (JJ-EL34II, Svetlana-S-EL34, Genalex KT77, Genalex KT-66, Sovtek KT-66, JJ-KT66, Svetlana 6L6 and so on, which beats the new SE EL 34 tube. If you have once heared them, there is no way back.
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